Preparation of semiconducting materials in the laboratory: Production of CdS thin films and estimation of their band gap energy

Abstract

Procedure and diagrams for production of CdS thin films and estimation of their band gap energy using relatively simple techniques.

Preparação de eletrodos opticamente transparentes

“…A energia do "gap" também é obtida do espectro de absorbância e é calculada pela Equação 2, onde E = energia do "gap" em eV e λ = comprimento de onda em nm 20 .…”

Evaluación de la actividad fotocatalítica de compósitos ZnS-rGO

“…Haciendo el cálculo de la energía de la banda prohibida por el procedimiento descrito en 16 , se obtienen los resultados que se muestran en la tabla I, donde es evidente que la incorporación del rGO trae como consecuencia la disminución de energía del band-gap de las muestras.…”

Synthesis of TiO2−xNy/Ag‐PbMoO4 Composite and Their Photocatalytic Activity Under Simulated Solar Light Irradiation

“…The Eg value was determined with the following relationship: α = A(hv − Eg) n / hv , where α is the absorption coefficient, hv is the photon energy, Eg the energy band gap, A and n are constants, and n has a value of n = 1/2 for materials with direct transition. To calculate the Eg from the UV–vis spectrum, a straight line was extrapolated following the slope of the line to the x ‐axis, where α = 0, and, consequently, Eg = hv . Compared with the absorption of Ag‐PbMoO 4 (~378 nm), the absorption edge of TiO 2− x N y has an intense absorption in the visible region at 426 nm.…”

“…To calculate the Eg from the UV-vis spectrum, a straight line was extrapolated following the slope of the line to the x-axis, where a = 0, and, consequently, Eg = hv. 48 Table 1). The FT-IR spectra of TiO 2 , TiO 2Àx N y , PbMoO 4 , Ag-PbMoO 4 , and TiO 2Àx N y /Ag-PbMoO 4 composite are shown in Fig.…”